Telephone system



Aug. 15,1944.

J. w. DEHN TELEPHONE 'SYSTEM 19 Sheets-Sheet 1 Filed July 20, 1945v NQ yAug 15, 1944. J. w. DEHN TELEPHONE SYSTEM Filed July 20, 1943 19sheets-sheet 2 /NVE/vro/a @y J WD5/1N ATTO/wey Aug. 15, 1944. J, w DEHNTELEPHONE SYSTEM* Filed July` 20, 1943 19 Sheets-Sheet `3 n N RN p 0H oWM w m MW J M Vr Aug. l5, 1944, J. w. DEHN TELEPHONE SYSTEM Filed July20, 1943 19 Sheets-Sheet a 0 IH w. m R T www N MOM MM@ VW. B

Aug. 15, 1944.

J. w.. DEHN 1 TELEPHONE SYSTEM 19 sheets-sheet 5 Filed July 20, 1943mut.

/NvE/VTOR J. W DEHN w um ATTORNEY A ug. 15, 1944. J. w. pl-:HN

` TELEPHONE SYSTEM Filed July 20, 1945 19 Sheets-Sheet 6 .m Um.

/lVl/ENTOR W DEH/V HVJ ATTORNEY Aug. 15, 1944. J, w, DEHN 2,355,908

' TELEPHONE SYSTEM Filed July 20, 1943 19 Sheets-Sheet 7 ROUTE RELA?ROI/7E RELAY BV Y A T 705W Aug. 15, 19444.

J. w. DEHN 2,355,908

- TELEPHONE SYSTEM Filed July 2o, 194s 19 sheets-sheet a II: /NVE/VTORJ. W. DEHN Aug.15`,1944. JQ wfDEHN 2,355,908

" TELEPHONE SYSTEM l Filed July 2o, 194s 19 shets-sheet 9 /NI/EN TOR jATTRNE v Aug. 15, 1944. 'J. w. DEHN '2,355,908 A TELEPHONE SYSTEM FiledJuly 2o, 194s 19 sheets-sheep 1o PULSE HSORBNG AND @E A I RG/J' TERSWITCH/N6 CQNTROL RELAY! l /NVENTOR J. W. DEHN BVMQWMN? ATTOR Aug. l5,1944. J. w.- DEHN 1 TELEPHONE SYSTEM 19 sheets-sheet 11 Filed July 20,1945 Au'g. 15, 1944. J. w. DEHN TELEPHONE suf-STEM Filed Juiyvzo; 194s19 Sheets-Sheet l2 Aug. 15, 1944.

J. w.` DEHN TELEPHONE SYS TEM Filed Ju1y 2o, 1943V 3 v m mww ML .y V.\n.n WM? v Aug. 15, 1944.

J'. w. DEHN TELEPHONE SYSTEM 19 Sheets-Sheet 14' /A/a/,eA/rof? J WDEHNBV #w1 Arrow/5y Filed July 20, 1943 Aug. 15, 1944. J. w. DEHN ITELEPHONE- SYSTEM 19 Sheets-Sheet 15 Filed July 20, 1943 /N VE N TORAug. l5, 1944. .1. w. DEHN `TELEPHONE SYSTEM Filed July 20, 1943 19Sheets-Shea?l l5 N VEN TOR By J W DEH/V ATTORNEY Aug. 15, 1944. J. w.DEHN TELEPHONE SYSTEM Filed July 2o, 1945 /Nl/EN729E J W DEH/V A Aug.l5, 1944. J. w. DEHN 2,355,908

' TELEPHONE SYSTEM Filed July 2o, 1943 19 sheets-sheet 18 T0 Off/ERROUTE RELAYJ' T0 0 THER C ROJJ' H4 R VER TICALS /M/E/wof? J W DE HN BV iATToPA/E J. w. DEHN TELEPHONE SYSTEM Aug. 15, 1944.

Filed July 20, 1945 19 Sheets-Sheet 19 13.31, .FSS ma@ L NS S m S \QS\t@ M l Sm mmm mmm wm Lili@ @HMM TE .m DMT VWMA N Patented Aug. 15, 1944TELEPHONE SYSTEM Joseph W. Dehn, Great Neck, N. Y., assignor to BellTelephone Laboratories, Incorporated, New York, N. Y., a corporation ofNew York Application July 20, 1943, Serial N0. 495,487

22 Claims.

.This invention relates to telephone systems and particularly to thosein which connections are established by automatic switches.

The object of the present invention is to enlarge the scope and improvethe operation of small dial responsive telephone offices.

A feature of this invention consists in a full automatic switching cnicefor small dial areas in a telephone exchange system in which alltelephone connections are under the control of a sender which isautomatically connected to calling lines responsive to the removal ofthe receiver in a calling subscribers station, the sender being arrangedto register the digits dialed for all telephone codes whether for alocal subscriber or a subscriberin another office area and for governingthe selection of means to be connected to a rst selector for positioningthe brushes of said rst selector, the Ysender in response to digits `ofa local code dialed by 'the calling subscriber causing the operation ofmeans for connecting the rst selector to the calling subscribers stationdial for controlling said rst selector and'in response to digits of acode of an oice in another oce area causing the operation of means inthe sender for connecting the rst selector to the sender pulsingmechanism for controlling said irst selector.

Anotherand related feature consists in an arrangement of control relaysresponsive to the operation of routing relays for omitting thetransmission of certain digit pulses for one type of office andtransmitting said digit pulses for another type of office.

Another and related feature consists in a combination of digitresponsive relays arranged to absorb a single first digit l from thecalling subscribers station when not followed by a second digit 1 andarranged to cause the registration of two successive digits 1-1 from thecalled subscribers station, the latter registration consisting of aprefix to one of two codes when two oilices having the same office codemay be dialed by a calling subscriber and consequently controlling therouting of the telephone connection.

.Another and related feature consists in a sender releasing mechanismunder the control of atiming device which times each interval betweendigits dialed, allowing a predetermined time interval for the firstpulse of a digit to follow the last pulse of a preceding digit, withmeans operated at the termination of this predetermined time intervalfor releasing the sender.

4:Another and related .feature consists in means in a sender under thecontrol of route relays for controlling the speed of transmitting digitpulses from sender pulsing mechanism to the pulse responsive mechanismsof distant ofces.

Another and related feature consists in means in a sender under thecontrol of route relays for transmitting slow speed pulses for digits tooperate step-by-step selectors for selecting an outgoing trunk to adistant oce and high speed pulses for digits to operate registers in thesender of the distant oiice.

Another and related feature consists in a simplied three-digit codetranslator for an automatic switch controlling sender for routing callsto various office areas.

Another and related feature consists in progressively operable mechanismvariably combined with the sender routing devices independent of thecode registers of the sender for controlling the number of digitstransmitted by the sender pulsing mechanism for selecting a trunkconnection and for controlling the number of pulses which constituteeach of said digits.

Another and related feature consists in the sender control of faultyoutgoing trunk circuits connected to the sender by a switch forcompleting a trunk connection, said outgoing trunk having lock-out meansoperable by the sender for removing said outgoing trunk from servicewhen the trunk is not responsive to pulses for completing a connectionto a distant oce.

The foregoing and other features of the invention will be described morefully in the following specification which should be taken in connectionwith the accompanying drawings and appended claims.

Referring to the drawings:

Fig. 1 illustrates a subscribers station connected over a line conductor`to line mechanism including terminals of a group of line iinders, oneline finder being shown in this figure;

Figs. 2 and 3 illustrate a line-lnder selector trunk circuit permanentlyconnected to the line nder of Fig. l;

t Fig. 4 illustrates a dual selector or rst selector permanentlyconnected to the line-finder selector trunk circuit of Figs. 2 and 3;Fig. 4 also diagrammatically illustrates two local oice secondselectors, a route selector, a direct trunk connection and a serviceoperators selector, all of which may be selected by the dual selector ofFig. 4;

Fig. 5 illustrates an outgoing trunk circuit having a lock-out device,diagrammatically illustrates other outgoing trunks which may havelock-out devices of the same character, and diagram-

